Artificial tooth



May 24, 1932. K

ARTIFICIAL TOOTH Filed Aug. 25, 1930 Patented May 24, 1932 i a STATES P T I f, "F 53 AUGUST MERK, or RAD-EBERG, GERMANY, Assrcrnon T ronZnntenrnnarK vo. M. I

norscnnnnaorrrsa A. G., or: DRESDEN, GERMANY ARTIFICIAL 'roozrn v Application filed. August 25, 1930, Serial K014775737; and in eeima a r'ii is, 1929.

more particularly to teeth which are adapted both sides of tl'ie'ri-b b I to be embedded in plastic material, for in- The two parallel passages into which the stance in caoutchouc, without the use of pins cavity'& is. subdivided by the rib b extend of precious metals and with or without a back fromthe seat Z across and at right angles to 55 plate. the Web (Z, and open'at the back of the tooth.

It is an object of my invention to provide Any number of ribs 1; may be provided. an artificial tooth which may be embedded in The opening of the cavity a in the seat Z the plastic material so as to be anchored at the upper end of the tooth is particularly 7 10 therein. V important for narrow teeth embedded in 60 To this end I. provide a cavity which eX- caoutch-ouc. The web (Z which extends subtends from a seat at the upper end of the stantially as far as the seat Z increases th tooth to its back in combination with a web strength of the tooth. Y 1 at the back of the tooth which bridges the The tooth which is preferably made of cavity and a rib in the cavity which extends porcelain, can be used with and without a' from the seat to the back of the tooth across back plate. If it is used without a back plate the web. the plastic material entering the cavity 0 and By these means I provide a tooth which has the passages at the sides of the rib Z) from a recess in its seat and two more recesses in the seat Z and from the back anchors the its back, all connected with the cavity. The tooth firmly. Additional hold is afforded by. recesses which are entered by the plastic magrooves 6. It is not necessary that the face terial, give the tooth a firm hold in the mate- 7 should project from the back of the tooth rial and facilitate the securing of a back but the tooth may be flat at the back if preplate on the tooth. ferred.

My invention relates to artificial teeth and grooves at the frontend of the face and at 25 In the drawings aflixed to this specification Artificial teeth according to my invention V and forming part thereof a tooth embodying are inserted in the plasticmaterial in a simmy invention is illustrated diagrammatically .ple and easy manner and effect a particularby way of example. ly durable connection with gum plates, arti- In the drawings I ficial jaws and the like, and are cheap on ac- I so Fig. 1 is an elevation of the tooth, viewed count of their simplicity. from its back, Referring now to Fig. 4, the tooth a is de- Figs. 2 and 3 are sections on the lines signedas described with reference to Figs. II-II and TIL-III in Fig. 1, respectively, 1-3 but combined with a back plate 9, which and is fitted to the seat Z at the upper end of the :55 Fig. 4 is a section of the tooth, also taken tooth and extends along its backas far as i on the line II-II in Fig. 1, showing a back the projection of theface f on which it is plate on the tooth. V abutted. Tabs m, n and 'Z areprovided for Referring now to the drawings, a is the holding the back plateat the seat Z,at the tooth, with a seat Z at the top and an edge 71. web 03 and the face f, respectively. The ends to at the base, and 0 is a cavity which extends of the tabs 11 are hooked so as toenter the from the seatZ to the back of the tooth. (Z grooves e. i V is a web at the back of the tooth which I. wish it to be understood that I do not bridges the cavity 0 and b is a central vertidesire to be limited to the exact details of cal rib which extends from a point slightly construction shown and described for obvi- -5 below the upper face of the web (Z through ous modifications will occur to a person the cavity 0 and as far as the back 'of the skilled in the art. V tooth subdividing the cavity into two par- .In the claims afiixed to this specification allel passages. f is a horizontal face at the no selection ofany particular modification of.

lower end of the rib which projects slightly :the invention is intended to the exclusionof eyond the back of the tooth and e, e are other modifications thereof;

I claim a I 1.- An artificial tooth having a cavity in its i seat, a plurality of longitudinal passages extending from said cavity to the back of the tooth, a bridge extending across said passages, a back plate, and means on said back plate for anchoringit in the'cavity of. said seat, on said bridge and in said passages.

2. An artificial tooth having a cavity in its 19 seat, a plurality of longitudinal passages extending from said cavity to the back of the tooth, a bridge extending across said passages, a projecting face at the back of said tooth, a groove at the inner end of said face v in each of said passages, a back plate, and means on said back plate for anchoring it on said seat, on said ,bridge, and in said grooves. v

In testimony whereof I aflix my signature.

AUGUST MERK. 

